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Topic: High School Atomic Physics  (Read 7601 times)

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Offline xstrae

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High School Atomic Physics
« on: July 13, 2006, 11:04:29 AM »
This problem i came across stumps me. can someone please guide me?

A series of lines in the spectrum of atomic hydrogen lies at wavelengths 656.46 , 482.7, 434.17, 410.29 nm. What is the wavelength of the next line in the series??
where do i begin?? ???

thanks in advance

Offline Albert

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Re: Atomic structure - hydrogen spectrum
« Reply #1 on: July 13, 2006, 11:25:32 AM »

Offline xstrae

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One more q related to atomic structure based on de broglie wavelength
« Reply #2 on: July 13, 2006, 11:32:23 AM »
Calculate the de broglie wavelength of an electron that has been acceleraed from rest through a potential differnece of 1kV.

 ???

Offline xstrae

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Re: Atomic structure - hydrogen spectrum
« Reply #3 on: July 13, 2006, 12:26:56 PM »
yup thanks a lot. the first was helpful.
all the wavelengths given above correspnd to the visible region of the electromagnetic spectrum. Therefore they belong to the Balmer series. so substituting in the formula, we get 396nm as the next in line. thanks! :)

Offline Donaldson Tan

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Re: High School Atomic Physics
« Reply #4 on: July 13, 2006, 02:16:45 PM »
Calculate the de broglie wavelength of an electron that has been acceleraed from rest through a potential differnece of 1kV.


The kinetic energy of the electron is there 1000 electron-volt (E = Q*V)

Since the electron mass is known, what is the momentum that corresponds to 1000 electron-volt kinetic energy?

you should be able to calculate the wavelength from the momentum using debroglie's equation.
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Offline xstrae

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Re: High School Atomic Physics
« Reply #5 on: July 14, 2006, 01:41:03 PM »
thanks a lot!  :)

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